af_vfs.c
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/*
Audio File Library
Copyright (C) 1999, Elliot Lee <sopwith@redhat.com>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307 USA.
*/
/*
af_vfs.c
Virtual file operations for the Audio File Library.
*/
#include "afinternal.h"
#include "af_vfs.h"
#include <stdlib.h>
AFvirtualfile *
af_virtual_file_new(void)
{
return (AFvirtualfile *) calloc(sizeof (AFvirtualfile), 1);
}
void
af_virtual_file_destroy(AFvirtualfile *vfile)
{
vfile->destroy(vfile);
free(vfile);
}
size_t af_fread (void *data, size_t size, size_t nmemb, AFvirtualfile *vfile)
{
if (size == 0 || nmemb == 0)
return 0;
if (vfile->read) {
int retval;
retval = (* vfile->read) (vfile, data, size * nmemb);
return retval/size;
} else
return 0;
}
size_t af_fwrite (const void *data, size_t size, size_t nmemb,
AFvirtualfile *vfile)
{
if (size == 0 || nmemb == 0)
return 0;
if (vfile->write) {
int retval;
retval = (* vfile->write) (vfile, data, size * nmemb);
return retval/size;
} else
return 0;
}
int
af_fclose(AFvirtualfile *vfile)
{
af_virtual_file_destroy(vfile);
return 0;
}
long
af_flength(AFvirtualfile *vfile)
{
if(vfile->length)
return (* vfile->length)(vfile);
else
return 0;
}
int
af_fseek(AFvirtualfile *vfile, long offset, int whence)
{
if(whence == SEEK_CUR)
(* vfile->seek) (vfile, offset, 1);
else if(whence == SEEK_SET)
(* vfile->seek) (vfile, offset, 0);
else
return -1;
return 0;
}
long
af_ftell(AFvirtualfile *vfile)
{
if(vfile->tell)
return (* vfile->tell)(vfile);
else
return 0;
}
static ssize_t af_file_read (AFvirtualfile *vfile, void *data, size_t nbytes);
static long af_file_length (AFvirtualfile *vfile);
static ssize_t af_file_write (AFvirtualfile *vfile, const void *data,
size_t nbytes);
static void af_file_destroy(AFvirtualfile *vfile);
static long af_file_seek(AFvirtualfile *vfile, long offset, int is_relative);
static long af_file_tell(AFvirtualfile *vfile);
AFvirtualfile *
af_virtual_file_new_for_file(FILE *fh)
{
AFvirtualfile *vf;
if(!fh)
return NULL;
vf = af_virtual_file_new();
vf->closure = fh;
vf->read = af_file_read;
vf->write = af_file_write;
vf->length = af_file_length;
vf->destroy = af_file_destroy;
vf->seek = af_file_seek;
vf->tell = af_file_tell;
return vf;
}
static ssize_t af_file_read(AFvirtualfile *vfile, void *data, size_t nbytes)
{
return fread(data, 1, nbytes, vfile->closure);
}
static long
af_file_length(AFvirtualfile *vfile)
{
long curpos, retval;
curpos = ftell(vfile->closure);
fseek(vfile->closure, 0, SEEK_END);
retval = ftell(vfile->closure);
fseek(vfile->closure, curpos, SEEK_SET);
return retval;
}
static ssize_t af_file_write (AFvirtualfile *vfile, const void *data,
size_t nbytes)
{
return fwrite(data, 1, nbytes, vfile->closure);
}
static void
af_file_destroy(AFvirtualfile *vfile)
{
fclose(vfile->closure); vfile->closure = NULL;
}
static long
af_file_seek(AFvirtualfile *vfile, long offset, int is_relative)
{
fseek(vfile->closure, offset, is_relative?SEEK_CUR:SEEK_SET);
return ftell(vfile->closure);
}
static long
af_file_tell(AFvirtualfile *vfile)
{
return ftell(vfile->closure);
}